package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import com.sky.vo.EmployeeVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.security.MessageDigest;
import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);
        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        //密码比对，一个数据库密码（加密密码），一个是前端密码（明文密码）
        // 思路：进行密码比对（把前端密码MD5加密一下，然后与数据库的进行比对）
        password = DigestUtils.md5DigestAsHex(password.getBytes());

        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    public Integer addEmp(EmployeeDTO employeeDTO) {
        //打印线程
        log.info("[service],{}", Thread.currentThread().getId());
        //把DTO转换成实体
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);

        //设置实体类的默认数据
        employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());

        //设置用户状态
        employee.setStatus(1);

        //设置密码
        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));

        //设置登录的用户ID

        employee.setCreateUser(1L);
        employee.setUpdateUser(1L);

        return employeeMapper.insertEmp(employee);
    }

    /**
     * 分页查询
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult findpage(EmployeePageQueryDTO employeePageQueryDTO) {
        //启动查询插件
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        List<Employee> list = employeeMapper.selecetByPage(employeePageQueryDTO.getName());
        Page<Employee> page = (Page<Employee>) list;

        PageResult pageResult = new PageResult();
        pageResult.setTotal(page.getTotal());
        pageResult.setRecords(page.getResult());
        return pageResult;
    }

    /**
     * 启用禁用
     *
     * @param status
     * @param id
     * @return
     */
    @Override
    public Integer openCloseEmp(Integer status, Long id) {
        Employee employee = Employee.builder()
                .status(status)
                .id(id)
                .build();

        return employeeMapper.updateById(employee);
    }

    /**
     * 查询Id
     *
     * @param id
     * @return
     */
    @Override
    public EmployeeVO foundById(Long id) {
        Employee employee = employeeMapper.getById(id);
        EmployeeVO employeeVO = new EmployeeVO();
        if (employee != null) {
            //BeanUtils.copyProperties方法是将两个字段相同的对象进行属性值的复制。
            // 如果 两个对象之间存在名称不相同的属性，
            // 则 BeanUtils 不对这些属性进行处理，需要程序手动处理。
            BeanUtils.copyProperties(employee, employeeVO);
        }

        return employeeVO;
    }

    @Override
    public Integer update(EmployeeDTO employeeDTO) {

        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        // BaseContext是基于ThreadLocal类封装的工具类，
        // 用于在同一线程中的封装数据和获取数据。
        employee.setUpdateUser(BaseContext.getCurrentId());
        employee.setUpdateTime(LocalDateTime.now());

        return employeeMapper.updateById(employee);
    }

    /**
     * 查询Id
     * @param id
     * @return
     */
//    @Override
//    public EmployeeVO foundById(Long id) {
//        Employee employee=employeeMapper.getById(id);
//        EmployeeVO employeeVO=new EmployeeVO();
//        if(employee!=null){
//            BeanUtils.copyProperties(employee,employeeVO);
//        }
//        return employeeVO;
//    }

    /**
     * 修改员工
     *
     * @param
     * @return
     */
//    @Override
//    public Integer update(EmployeeDTO employeeDTO) {
//        Employee employee=new Employee();
//        BeanUtils.copyProperties(employeeDTO,employee);
//        employee.setUpdateUser(BaseContext.getCurrentId());
//        employee.setCreateTime(LocalDateTime.now());
//
//        return employeeMapper.updateById(employee);
//    }

    //md5加密的其中一种方式
    public static String getMD5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] messageDigest = md.digest(input.getBytes());
            StringBuilder hexString = new StringBuilder();

            for (byte b : messageDigest) {
                hexString.append(String.format("%02x", b));
            }

            return hexString.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}
